Mathematical Model of Seismoexplosion in Tunnel Surrounding

2015 ◽  
Vol 744-746 ◽  
pp. 1021-1026
Author(s):  
Pavel Svoboda ◽  
Alexander N. Kravtsov
Keyword(s):  
Communication Networks ◽  
Laminated Composite ◽  
Critical Infrastructures ◽  
Material Damage ◽  
Composite Cylinder ◽  
Underground Structures ◽  
Governing Equations ◽  
Modeling And Analysis ◽  
Structure Damage ◽  
Hydromechanical Process

The construction of objects of critical infrastructures such as a new roads, utility tunnels, communication networks, underground parks and other structures is associated by the way with generation of vibrations in the vicinity of the underground structures, and not only human lives can be lost but also extensive material damage can be expected due to technological and natural hazards based on vibrations. This paper presents the general governing equations for coupled thermo-hydromechanical process in the tunnel surrounds. Modeling and analysis of laminated composite cylinder applied for the objective analysis of shock wave propagation in the soils and possibilities to estimates of the tunnel structure damage.

scholarly journals Non-linear analysis of laminated composite doubly curved shallow shells

2006 ◽  
Vol 28 (1) ◽  
pp. 43-55
Author(s):  
Dao Huy Bich
Keyword(s):  
Laminated Composite ◽  
Governing Equations ◽  
Shallow Shells ◽  
Approximate Analytical Solutions ◽  
Linear Buckling ◽  
Non Linear ◽  
Vibration Problems ◽  
Doubly Curved ◽  
Analytical Expressions ◽  
Load Deflection Curve

This paper deals with governing equations and approximate analytical solutions based on some wellknown assumptions to the non-linear buckling and vibration problems of laminated composite doubly curved shallow shells. Obtained results will be presented by analytical expressions of the lower critical load, the postbuckling load-deflection curve and the fundamental frequency of non-linear free vibration of the shell.

Harmonic Wave Propagation of Ultrasonic Arc Stators

Aerospace ◽  
2003 ◽  
Author(s):  
P. Smithmaitrie ◽  
J. G. DeHaven ◽  
K. Higuchi ◽  
H. S. Tzou
Keyword(s):  
Finite Element ◽  
Traveling Waves ◽  
Traveling Wave ◽  
Harmonic Wave ◽  
Finite Element Models ◽  
Governing Equations ◽  
Modeling And Analysis ◽  
Element Simulation ◽  
Simulation Results ◽  
Harmonic Analyses

A piezoelectric curvilinear arc stator designed for an ultrasonic curvilinear motor is studied in this research. Design of piezoelectric curvilinear arc stator is proposed and its governing equations and vibration behavior are investigated. Then, analysis of forced vibration response or driving characteristics to harmonic excitations in the modal domain is conducted. Finite element modeling and analysis of the arc stator are also discussed. Analytical results of free vibration characteristics are compared favorably with the finite element results. Harmonic analyses of the three finite element models reveal changes of dynamic behaviors of three models and also imply operating frequencies with significant traveling wave component. Study of mathematical and finite element simulation results suggests that stable traveling waves can be generated to drive a motor on the proposed curvilinear arc stator system.

Modeling and Analysis of Zone-Based Registration in Mobile Communication Network by Considering Busy-Line Effect and Implicit Registration

2016 ◽  
Vol 33 (04) ◽  
pp. 1650024 ◽  
Author(s):  
Jong Hun Park ◽  
Jihee Jung ◽  
Janghyun Baek
Keyword(s):  
Mathematical Modeling ◽  
Communication Networks ◽  
Mobile Communication ◽  
Modeling And Analysis ◽  
Network Database ◽  
Incoming Call ◽  
Mobile Communication Networks ◽  
And Performance ◽  
Current Zone ◽  
Paging Cost

In this study, we consider zone-based registration (ZBR) in mobile communication networks. In ZBR, when a mobile moves to a new zone, it registers its zone to the network database to keep the mobile’s current zone, and to connect an incoming call to the mobile when it is generated. A mobile can store one zone, or more than one zones. Among various types of ZBR, we focus on two-zone-based registration (TZR), which is known to have good performance. In TZR, a mobile can store two zones that it has recently registered, and does not register when it crosses either zone that it has already kept. In general, in TZR, a mobile registers its zone less often than in single-zone-based registration (SZR). However, TZR increases the paging cost, because the network may not know the exact zone where the mobile is. Mathematical modeling and performance analysis are performed to obtain the exact performance of SZR and TZR, by considering the busy-line effect and implicit registration effect of outgoing calls from a mobile. From numerical results for various circumstances, it is shown that TZR is superior to SZR in most cases.

Inflight Deicing of Self-Actuating Aircraft Wing Structures With Piezoelectric Actuators

2002 ◽  
Author(s):  
Y. J. Lin ◽  
Suresh V. Venna
Keyword(s):  
Finite Element ◽  
Natural Frequencies ◽  
Laminated Composite ◽  
Piezoelectric Actuators ◽  
Element Model ◽  
Harmonic Excitation ◽  
Dynamic Responses ◽  
Underlying Structure ◽  
Shear Stresses ◽  
Modeling And Analysis

Self-actuating aircraft wings for in-flight deicing with minimal power requirements are proposed. Lightweight piezoelectric actuators are utilized to excite the wing structure to its natural frequencies to induce shear stresses on the surface of the wing. The shears are generated in such a way that they are sufficient to break the weak bond between the ice layer and the wing surface. A laminated composite cantilever plate is used for the modeling and analysis. Analytical model is developed to predict the natural frequencies and shear stresses on the surface of the plate and finite element modal analysis is carried out to verify the results. In addition, finite element model involving the ice deposited on the underlying structure is built. The dynamic responses of the structure to harmonic excitation to its first five natural frequencies are investigated. It is observed that significant amount of ice de-bonding from the substrate occurs in the third mode, or the second symmetric mode. Moreover, the energy requirements of the piezoelectric actuators to actuate an adaptive composite structure with given weight are evaluated.

scholarly journals Modeling and Analysis of Mobility Management in Mobile Communication Networks

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Woon Min Baek ◽  
Ji Hyun Yoon ◽  
Chesoong Kim
Keyword(s):  
Mathematical Model ◽  
Communication Networks ◽  
Mobile Communication ◽  
Mobility Management ◽  
Numerical Results ◽  
Modeling And Analysis ◽  
Mobile Communication Networks ◽  
Special Zone

Many strategies have been proposed to reduce the mobility management cost in mobile communication networks. This paper studies the zone-based registration methods that have been adopted by most mobile communication networks. We focus on two special zone-based registration methods, called two-zone registration (2Z) and two-zone registration with implicit registration by outgoing calls (2Zi). We provide a new mathematical model to analyze the exact performance of 2Zand 2Zi. We also present various numerical results, to compare the performance of 2Ziwith those of 2Zand one-zone registration (1Z), and show that 2Ziis superior to 2Zas well as 1Zin most cases.

Sign in / Sign up

Export Citation Format

Share Document